Airbag

Abstract

An airbag for protecting an occupant includes a left half airbag having an inner panel and a right half airbag having an inner panel. At least one outer panel is provided and a seam allowance is provided on at least one of the inner panels when the left and right inner panels are stitched together. When the airbag is inflated, the seam allowance extends into an inside part of the airbag and controls inflation of the airbag in a vertical direction.

1 . An airbag for protecting an occupant, comprising: 
 a left half airbag having a left inner panel;    a right half airbag having a right inner panel; wherein the left and right inner panels are connected together to thereby form a gap between the half airbags;    at least one outer panel; and    a seam allowance, provided on at least one of the inner panels when the left and right inner panels are connected together,    wherein, when the airbag is inflated, the seam allowance extends into an inside part of the airbag and is configured to control inflation of the airbag in a vertical direction.    
     
     
         2 . The airbag of  claim 1 , further comprising a left outer panel and a right outer panel.  
     
     
         3 . The airbag of  claim 1 , wherein the inner panels are formed into an asymmetrical shape.  
     
     
         4 . The airbag of  claim 1 , wherein a seam allowance is provided on both of the inner panels when the left and right inner panels are stitched together.  
     
     
         5 . The airbag of  claim 1 , wherein the seam allowance is provided inward of the airbag from a stitched portion of the left and right inner panels.  
     
     
         6 . The airbag of  claim 1 , wherein the seam allowance reduces inflation of the airbag in the vertical direction.  
     
     
         7 . The airbag of  claim 1 , wherein the seam allowance increases inflation of the airbag in a left and right direction.  
     
     
         8 . The airbag of  claim 1 , wherein the seam allowance is at least 50 mm in width.  
     
     
         9 . The airbag of  claim 1 , wherein the seam allowance has a constant width.  
     
     
         10 . The airbag of  claim 1 , wherein the seam allowance has a variable width.  
     
     
         11 . The airbag of  claim 1 , further comprising a positioning pin in the seam allowance.  
     
     
         12 . The airbag of  claim 1 , wherein the left and right airbags are inflated by a common inflator.  
     
     
         13 . The airbag of  claim 2 , further comprising vent holes in the left and right outer panels.  
     
     
         14 . The airbag of  claim 13 , wherein the vent holes are provided at symmetrical positions on the left and right outer panels.  
     
     
         15 . The airbag of  claim 1 , wherein the left and right inner panels form a concave shape.  
     
     
         16 . The airbag of  claim 1 , wherein an edge shape of a stitching portion has a same shape as an edge shape of one of the inner panels.  
     
     
         17 . The airbag of  claim 12 , further comprising a communication portion for the common inflator.  
     
     
         18 . The airbag of  claim 1 , wherein the seam allowance increases a depth of a central portion of the airbag.  
     
     
         19 . An airbag module, comprising: 
 a left half airbag having a left inner panel;    a right half airbag having a right inner panel; wherein the left and right inner panels are connected together to thereby form a gap between the half airbags;    at least one outer panel; and    a seam allowance, provided on at least one of the inner panels when the left and right inner panels are connected together,    wherein, when the airbag is inflated, the seam allowance extends into an inside part of the airbag and is configured to control inflation of the airbag in a vertical direction; and    an inflator for providing inflation gas to the airbag.    
     
     
         20 . A vehicle provided with an airbag device comprising an airbag and an inflator for inflating the airbag, the airbag comprising: 
 a left half airbag having a left inner panel;    a right half airbag having a right inner panel; wherein the left and right inner panels are connected together to thereby form a gap between the half airbags;    at least one outer panel; and    a seam allowance, provided on at least one of the inner panels when the left and right inner panels are connected together,    wherein, when the airbag is inflated, the seam allowance extends into an inside part of the airbag and controls inflation of the airbag in a vertical direction.